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Vogtle Units No. 3 and No. 4 Construction Project - Narrative (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
unit
MW
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Vogtle Units No. 3 & No. 4      
Public Utility Property Plant and Equipment      
Ownership interest (as a percent) 30.00%    
Vogtle Units No. 3 & No. 4 | EPC Agreement | Westinghouse Electric Company LLC and Stone & Webster, Inc.      
Public Utility Property Plant and Equipment      
Number of nuclear units | unit 2    
Vogtle Units No. 3 & No. 4 | Ownership participation agreement      
Public Utility Property Plant and Equipment      
Ownership share, generating capacity (in megawatts) | MW 660    
Total construction costs paid $ 8,300,000,000    
Proceeds from settlement agreement 1,100,000,000    
Vogtle Units No. 3 & No. 4 | Ownership participation agreement | Minimum      
Public Utility Property Plant and Equipment      
Additional capital costs incurred 10,000,000    
Vogtle Units No. 3 & No. 4 | Ownership participation agreement | Maximum      
Public Utility Property Plant and Equipment      
Additional capital costs incurred 20,000,000    
Vogtle Units No. 3 & No. 4 | Global Amendments to Term Sheet | Jointly Owned Nuclear Power Plant | Georgia Power      
Public Utility Property Plant and Equipment      
Total construction costs paid 418,000,000    
Vogtle Unit Number 3 | Georgia Power      
Public Utility Property Plant and Equipment      
Nuclear production tax credit $ 32,800,000 $ 0 $ 21,700,000